Because I/we have done long walks like that before, on park days, we would think about catching a cab.
But walking isn't that awful, so if you want to walk, just walk like you're going to the parks. Go through bag check (if your PS is really early the bag check people might not even be there and in that case just walk on through), walk across the esplanade, and go out the other side of bag check into DTD.
Walk through DTD until Sephora on the left and Haagen Dasz on the right.
At this point you have a choice. Keep walking through to see all of DTD, go past DLH, behind the theater, and along the pathways to PPH which you will enter in the back and find the restaurant.
Or turn into the GCH entrance immediately after Sephora, walk along the concrete path. Go in the automatic doors, turn left, walk along the corridor. Go up into the lobby of the GCH, turn right, go out the big doors of the GCH. Once you're outside, turn left, you'll see the PPH...walk along the sidewalk to the crosswalk, cross over, there you are. Enter, find restaurant, enjoy the pineapple scones!